mirror of
https://github.com/wader/fq.git
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9b81d4d3ab
Preparation to make decoder use less memory and API more type safe. Now each scalar type has it's own struct type so it can store different things and enables to have a scalar interface. Also own types will enable experimenting with decode DLS designs like using chained methods that are type aware.
92 lines
3.5 KiB
Go
92 lines
3.5 KiB
Go
package inet
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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func init() {
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interp.RegisterFormat(decode.Format{
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Name: format.ICMPV6,
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Description: "Internet Control Message Protocol v6",
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Groups: []string{format.IP_PACKET},
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DecodeFn: decodeICMPv6,
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})
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}
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// based on https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol_for_IPv6
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var icmpv6TypeMap = scalar.UintMap{
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1: {Sym: "unreachable", Description: "Destination unreachable"},
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2: {Sym: "too_big", Description: "Packet too big"},
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3: {Sym: "time_exceeded", Description: "Time exceeded"},
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4: {Sym: "parameter_problem", Description: "Parameter problem"},
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100: {Description: "Private experimentation"},
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101: {Description: "Private experimentation"},
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127: {Description: "Reserved for expansion of ICMPv6 error messages"},
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128: {Sym: "echo_reply", Description: "Echo Request"},
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129: {Sym: "echo_request", Description: "Echo Reply"},
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130: {Description: "Multicast Listener Query (MLD)"},
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131: {Description: "Multicast Listener Report (MLD)"},
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132: {Description: "Multicast Listener Done (MLD)"},
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133: {Description: "Router Solicitation (NDP)"},
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134: {Description: "Router Advertisement (NDP)"},
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135: {Description: "Neighbor Solicitation (NDP)"},
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136: {Description: "Neighbor Advertisement (NDP)"},
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137: {Description: "Redirect Message (NDP)"},
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138: {Description: "Router Renumbering Router Renumbering Command"},
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139: {Description: "ICMP Node Information Query"},
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140: {Description: "ICMP Node Information Response"},
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141: {Description: "Inverse Neighbor Discovery Solicitation Message"},
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142: {Description: "Inverse Neighbor Discovery Advertisement Message"},
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143: {Description: "Multicast Listener Discovery (MLDv2) reports (RFC 3810)"},
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144: {Description: "Home Agent Address Discovery Request Message"},
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145: {Description: "Home Agent Address Discovery Reply Message"},
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146: {Description: "Mobile Prefix Solicitation"},
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147: {Description: "Mobile Prefix Advertisement"},
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148: {Description: "Certification Path Solicitation (SEND)"},
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149: {Description: "Certification Path Advertisement (SEND)"},
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151: {Description: "Multicast Router Advertisement (MRD)"},
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152: {Description: "Multicast Router Solicitation (MRD)"},
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153: {Description: "Multicast Router Termination (MRD)"},
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155: {Description: "RPL Control Message"},
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200: {Description: "Private experimentation"},
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201: {Description: "Private experimentation"},
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255: {Description: "Reserved for expansion of ICMPv6 informational messages"},
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}
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var icmpv6CodeMapMap = map[uint64]scalar.UintMapDescription{
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1: {
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1: "Communication with destination administratively prohibited",
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2: "Beyond scope of source address",
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3: "Address unreachable",
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4: "Port unreachable",
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5: "Source address failed ingress/egress policy",
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6: "Reject route to destination",
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7: "Error in Source Routing Header",
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},
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3: {
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0: "Hop limit exceeded in transit",
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1: "Fragment reassembly time exceeded",
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},
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4: {
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0: "Erroneous header field encountered",
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1: "Unrecognized Next Header type encountered",
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2: "Unrecognized IPv6 option encountered",
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},
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}
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func decodeICMPv6(d *decode.D, in any) any {
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if ipi, ok := in.(format.IPPacketIn); ok && ipi.Protocol != format.IPv4ProtocolICMPv6 {
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d.Fatalf("incorrect protocol %d", ipi.Protocol)
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}
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typ := d.FieldU8("type", icmpv6TypeMap)
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d.FieldU8("code", icmpv6CodeMapMap[typ])
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d.FieldU16("checksum")
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d.FieldRawLen("content", d.BitsLeft())
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return nil
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}
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